Improvement in knife-scourers



UNITED STATES PATENT OFFICE.

WILLIAM It. HANKS, OF YVELLESLEY, ASSIGNOR TO HIMSELF, WILLIAM M.CURTIS, AND HENRY J. HANKS, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN KNlFE-SCOURERS.

Specification forming part of Letters Patent No. 149,305, dated April 7,1874; application filed March 11, 1874.

To all whom it may concern:

Be it known that I, WVILLIAM It. HANKS, of Wellesley, of the county ofNorfolk and State of Massachusetts, have invented a new and usefulImprovement in Knife-Scourcrs; and do hereby declare the same to befully described in the following specification and represented in theaccompanying drawings, of which Figure 1 denotes a top view, Fig. 2 afront elevation, Fig 3 a longitudinal section, and Fig. 4. a transversesection, of a knife-scourer, constructed in accordance with myinvention. Fig. 5 is a top View, and Fig. 6 a longitudinal section, ofits metallic base. Fig. 7 is an under-side view, and Fig. 8 alongitudinal sec tion, of its metallic cap.

The invention has reference to knife-scourers provided with two abrasiveelastic cylinders, one of such kind being represented in the UnitedStates Patent No. 136,188.

In my improved article each of the two elastic cylinders A B is acomposition of indiarubber or gutta-percha and emery, the two beingmixed in suitable proportions, and molded to the shape required. Thesecylinders are supported within a base, D, having two cylindricalsockets, a a, to receive the cylinders at their lower ends. Ametalliccap, 0, provided with two similar sockets, b b, and with ears 0 0,arranged as shown, covers and receives the upper ends of the twocylinders, and is confined to them, and holds them to the base by meansof two screw bolts, E E, extended down through the ears of the cap andscrewed into the base. The said base has two cars, at d, projecting fromit at its middle, and perforated to receive screws for fastening it downupon a bench or table.

When a two-cylinder knife-scourer has the cylinders of rubber coatedwith emery, and supported upon a base by metallic rods extend ingtherefrom up through the axes of the two cylinders, the cylinders, inorder that fresh surfaces of emery may be brought into e011- junction,have to be revolved on the rods.

- In practice it has been found that the abrasive material soon wearsoff, and, as a consequence, the scourer very shortly becomes use less.

With my scourer the cylinders not only can be revolved, but, in case ofbecoming worn, may be moved either toward or away from each other, asoccasion may require, and, being throughout of an abrasive composition,they will last a very long time. In my scourer no spring is required toconnect the two rods. Each cylinder being supported in sockets, it,under pressure of a knife, is at liberty to contract across its entirediameter; whereas, when the cylinders are supported by rods going upthrough them, each, when pressed by the knife, can contract only fromthe rod to the circumference of the cylinder.

The advantages of my construction of knifescourer will thus be apparent.

I do not claim a knife-scourer made as described in the United StatesPatentNo. 136,188.

I claim The improved knife-scourer composed of the socketed base D andsocketed cap 0, connection screw-rods E E, and two abrasive cylinders, AB, constructed and applied substantially as specified.

*ILLIAM R. HANKS.

Witnesses R. H. EDDY, J. R. Snow.

